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This research publication has been funded by the projects: AgroMOFs TED22021-13244B-I00, MOFCycle CNS2022-135779, and NAPOLION PID2022-139956OB-I00, TED2021-131345B-I00 PID2022-140422OB-I00, supported by MICIU/AEI/10.13039/501100011033/and FEDER "Una manera de hacer Europa"; B-FQM-394, ProyExcel_00105 and 00386, and PLSQ_00188 funded by Junta de Andalucia; and IB20092 supported by the Government of Extremadura and Project Action VI-03, supported by University of Extremadura, Spain. S.R. is grateful for the grant (RYC2021-032522-I) funded by MCIN/AEI/10.13039/501100011033 and for El FSE invierte en tu futuro. P.S.-A. thanks Juan de la Cierva Grant JDC2022-048964-I funded by MICIU/AEI/10.13039/501100011033 and by "European Union NextGenerationEU/PRTR

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Calcium Medronate-Based Metal-Organic Frameworks as Multifunctional Biomaterials

Publicat a:Crystal Growth & Design. 25 (5): 1415-1422 - 2025-02-20 25(5), DOI: 10.1021/acs.cgd.4c01478

Autors: Salcedo-Abraira, Pablo; Fernandez-Grajera, Maria; Guerrero-Roman, Francisco A; Rodriguez-Dieguez, Antonio; Luque-Agudo, Veronica; Gonzalez-Martin, Maria Luisa; Gallardo-Moreno, Amparo M; Rojas, Sara

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Metal-organic frameworks (MOFs) can be prepared from bioactive molecules, which are released during the degradation of the material in the body. Particularly, MOFs have recently emerged as bisphosphonate (BP) drug delivery systems. In this work, two novel MOFs based on the smallest bisphosphonate medronic acid (MA) and calcium with formulas [Ca(CH4O6P2)H2O] (GR-MOF-23) and [Ca(CH4O6P2)CH3OH] (GR-MOF-24) in aqueous and/or methanolic solutions at room temperature were synthesized and fully characterized. The stability test performed in simulated physiological conditions (a phosphate buffer saline (PBS, pH = 7.4, 10 mM) solution at 37 degrees C) showed a progressive Ca2+ leaching from both GR-MOF-23 and GR-MOF-24, achieving 38.0 +/- 2.8 and 35.8 +/- 3.9% release of calcium after 1 week of suspension. Interestingly, the recovered solid residues from the stability tests were identified as apatite and calcium phosphate phases, which might facilitate the formation of bone apatite and collagen. The antibacterial activity of GR-MOF-23 and GR-MOF-24 was investigated against Escherichia coli and Staphylococcus aureus, among the most relevant human pathogens, causing a wide variety of infections in bone fracture in osteoporosis and prosthesis. While both materials exhibited bacteria growth inhibition, GR-MOF-24 also showed a bactericide action, likely due to a more progressive release of Ca2+, which is the ion related to the improved stability of the biofilm. These innovative materials present exciting opportunities for developing antibacterial surfaces in prosthetics and the treatment of bone fracture infections.

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